Use the conversion ratio 1 kilometer equals about 0.62 miles to solve the following problem. It may help to set up a proportion.

Question

An airplane travels about 900 kilometers per hour. What is the airplane's speed in miles per hour?

1 kilometer
0.62 miles

A
1451.6

B
558

C
1240

D
899.38

Answer 1

To convert the speed of the airplane from kilometers per hour to miles per hour using the ratio of 1 kilometer equals 0.62 miles, you can set up a proportion or simply multiply by the conversion factor.

Here’s how to do it using the conversion factor:

1. Start with the speed in kilometers per hour: 900 kilometers per hour.
2. Multiply by the conversion factor (0.62 miles per kilometer):

\[ 900 \text{ km/h} \times 0.62 \text{ miles/km} = 558 \text{ miles/h} \]

So, the airplane's speed in miles per hour is 558 miles per hour.

Thus, the correct answer is B: 558.